Laser (lā'zər) is short for Light Amplification by Stimulated Emission of Radiation. Simply put, it's a device that emits an intense beam of visible or invisible (infrared) light that remains focused over a great distance without dispersing. The beam is a product of atoms being pushed to a higher energy level causing them to release energy simultaneously.
Laser Pointer - a small laser device often used for pointing at objects by illuminating them with a collimated visible laser beam. Most laser pointers contain a small GaInP/AlGaInP laser diode operating somewhere in the red spectral region. Unlike Red lasers, Green and Blue laser pointers however are significantly more expensive to produce using small diode-pumped solid state laser with a nonlinear crystal for frequency doubling.
Wavelength - the distance between one peak of a wave of light, heat, or other energy and the next corresponding peak. Our eyes are sensitive to a small region of “visible light” in the electromagnetic spectrum with a wavelength range of 400-700 nanometers (nm) and a color range of violet through red. Green (532nm) is the brightest compared to Blue (473nm) and Red (432nm). Infrared (808nm, 980nm, 1604nm) however is outside the visible spectrum and is invisible making it dangerous and should only be handled by professionals.
Class IIIb Lasers - is a classification of lasers with intermediate power strong enough to be considered hazardous to the naked eye and should only be handled with proper safety gear.
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